jenv:tldr:b6258

This command is using a tool called "jenv" to set the current shell's Java version to the value stored in the environment variable "java_version".

Here's a breakdown of each part:

• "jenv" is a command-line tool used to manage multiple Java versions on a single system.
• "shell" is a subcommand of "jenv" which sets the Java version for the current shell session.
• "${java_version}" is a parameter that refers to the value stored in the environment variable "java_version". This environment variable must be previously defined and hold the desired Java version.

So, when executing this command, the current shell session will switch to use the Java version specified by the value in the "java_version" environment variable.